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Originally Posted by GUILLE How did he get to the same result from a different way? |
Reference: Schiff, "Quantum Mechanics," 2nd Ed., Chap XII, p323, p338, McGraww-Hill, 1955.
Both the Schroedinger and Dirac relativistic equations have negative solutions for kinetic energy and rest mass. These solutions is the same as the negative square root of the classical energy equation from special relativity

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